Embroidery-frame-suspension device.



No. 803,656. PATENTED NOV. 7, 1905.

R. ZAHN.

EMBROIDERY FRAME SUSPENSION DEVICE. APPLICATION IILED MAR.3, 1904.

Witnesses.

PATENT OFFICE.

ROBERT ZAHN, OF PLAUEN, GERMANY.

EMBROIDERY-FRAME-SUSPENSION DEVICE.

Specification of Letters Patent.

Patented Nov. '7', 1905.

Application filed March 3,1904. Serial No. 196,363.

To (tZZ whom, it may concern:

Be it known that I, ROBER'IZAHN, asubject of the German Emperor, residing at Plauen, in the Kingdom of Saxony and Empire of Germany, have invented certain new and useful Improvements in Em broidery-Frame-Suspension Devices, of which the following is a specification.

This invention relates to an embroideryframe suspension for embroidering-machines, wherein the frame at its two ends reposes upon a lever respectively forming a rigid whole with two other levers,which at their two ends by means of tightly-stretched mechanism are connected to two similar levers at the other end of the frame. This forced connection of the two carrying-levers brings about an advantage especially important with very long embroidery-frames, consisting in the fact that the two ends of the frame are forced to make fully analogous movements on the frame, being driven at one end only by the pantograph.

In the annexed drawings two forms of construction of my invention are represented.

Figure 1 is a front view; Fig. 2, a top view of one form of construction; Fig. 3, an elevation, and Fig. 4 a side view, of the most important parts of the other form of construction.

In Figs. 1 and 2, a indicates the left front partition of the machine-frame, Z) the superior front, and c the superior back main longitudinal girder of the machine. Upon the front partition (6 two powerful pillow-blocks d arefastened, carrying the shaft 6 of a bandpulley f g in a bearing almost totally free of frictionfor instance, in aball-bearing. This band-pulley, which upon its circumference receives the two strong steel bands h 2', is preferably constructed as shown in Figs. 1

and 2, 'where the pulley is not cylindrical upon its whole circumference, but, moreover, conslsts of cylindrical segment-pieces, and thus forms a sort of two-armed lever, referred to' in thepreamble. By means of a suitable tension device the very strong tightening of the bands hi may be regulated in an easy and effective manner. This tension device consists of a threaded tension-block k, attached to the end of the bands by riveting or in any other suitable manner,respectively, and may be connected to a head Z by means of a nut and lock-nut. Rigidly connected to the band-pulley f g is the edged frame-carrying lever on and the counterpoise-lever 12. On the free end of the lever m the stilt 0 is arranged in bearing also nearly fully free of friction, and upon said stilt the embroidery-frame reposes or bears by means of the so called street q, rigidly attached to it.

Precisely the same arrangement as above described, eventually without the counterweight w and lever 02., is also providedat the right side of the machine, so that by means of the tightly-stretched bands It and t' a forced connection of both band-pulleys f g is gained By means of this forced transmission of motion from one band-pulley to the other one the guiding of the embroidery-frame,designed as advantageous in the preamble, is brought about in a very efiective manner,and the slightest movements of one band-pulley are instantly and without any difference supplied to the other pulley, a result which heretofore it was impossible to attain with the means of transmission well known in embroidering machines. This advantageous efifect may be explained by the fact that the two bands It and i may be chosen of such large cross-section and may be so tightened by means of the tension device is Z that the surplus load on the bands resulting from the acceleration of the masses is not able to produce any remarkable change of the bands in length, because this surplus load makes up only asmall percentage of the load which exists in the device when at rest and consists of the weight of the frame and its counterweight, but also is produced by the tightening of the tension-bands by means of the tension device in Z.

In the device schematically shown in Figs. 3 and 4 the same letters of reference are used as in Figs. 1 and 2, so that this construction will be fully understood when referring to the latter figures. On the shaft 6, supported in the same manner as in Figs. 1 and 2, the embroidery-frame lever m and the counterweightlever n are arranged. However, instead of the two cylindrical band-pulley segment-s f and g a two-armed lever f g is used, and at the free ends of this lever the tension mechanismfor instance,steel wires It i-are rotatably arranged. In Fig. 3 the lever f gm,

situated at the right side of, the machine, is

connecting said arms, securing synchronous movement of said levers, and tension devices for said Wires.

2. In an embroidering-machine the combination of a frame, shafts located at opposite ends of said frame, levers mounted on said shafts having oppositely-projecting segments, metallic straps or Wires connecting said segments, tension devices on said segments for 

